Electric Toothbrush Rotating Head Gear Mechanism

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Solution Overview

Problem

Existing electric toothbrushes have complex internal structures, high production costs, and are prone to damage due to high-speed motor rotation, making them inflexible and inconvenient to use, with poor tooth cleaning effects and high replacement head installation challenges.

Innovation Solution

The electric toothbrush rotating replacement head device features a simple structure with a rotating shaft and gear mechanism, stainless steel pin interference fit, and copper-free bristle planting, allowing for stable and efficient tooth cleaning with easy installation and disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high-speed motor rotation is used to drive brush head vibration, then tooth cleaning effect is improved, but device complexity and production cost increase

Engineering Contradiction:

Improvetooth cleaning effectVSAvoidinternal structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the motor from the handle and relocates it to the replacement head. This allows the motor to be independently replaceable, simplifying the handle structure while maintaining the vibration function. The motor is now part of the modular head assembly rather than an integrated component of the entire toothbrush system.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The toothbrush system is divided into separable modules: the handle and the replacement head can be easily detached and reattached. This segmentation allows the motor-containing head to be replaced independently, reducing the complexity burden on the permanent handle structure while preserving the cleaning function.

Inventive Principle:

Principle #1Segmentation

2Reliability

If complex transmission assembly is used for high-speed rotation, then brush head vibration is achieved, but structure stability decreases and damage rate increases

Engineering Contradiction:

Improvebrush head vibrationVSAvoidinternal structure stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The complex transmission assembly is extracted from the handle and relocated to the replacement head. This eliminates the need for stable, permanent transmission mechanisms in the handle, as the entire head assembly with its own motor and simple transmission can be easily replaced if damaged.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The replacement head, containing the motor and transmission assembly, is designed as a disposable or easily replaceable component. Rather than protecting expensive, complex transmission mechanisms permanently, the system accepts that these will wear out and requires simple replacement of the entire head unit.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If traditional replacement head connection is used, then radial and axial forces are absorbed, but installation flexibility and convenience decrease

Engineering Contradiction:

Improveforce transmissionVSAvoidinstallation convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The connection mechanism is segmented into simple, modular components: a connection rod with connection portion and a corresponding connection structure on the head. This segmentation enables easy snap-fit installation while maintaining adequate force transmission through the separated connection points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a complex permanent connection that requires precise force absorption, the patent inverts the approach by using a simple, reversible connection that prioritizes ease of installation. The force transmission is handled by the basic mechanical connection rather than specialized force-absorbing structures.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design provides a stable, noise-reduced, and effective cleaning mechanism with reduced rusting pollution, enhancing user convenience and cleaning performance while minimizing structural instability and costs.

Implementation Method 1

The pin is in an interference fit with the pin installation hole

Methodology Applied

Scientific EffectInterference fit: Friction

Implementation Method 2

A top of the rotating shaft is provided with a driving gear, and the driving gear is meshed with the driven gear

Methodology Applied

Scientific EffectGear mechanism: Gear

Data Source

PatentUS12127900B1Electric toothbrush rotating replacement head device

Publication Date: 2024.10.29 LIU HANWU

AI summary

An electric toothbrush rotating replacement head device includes: a toothbrush replacement head body including a toothbrush handle and a toothbrush head. The toothbrush handle defines a cavity, and the toothbrush head is disposed on a top of the cavity. A rotating shaft is disposed in the cavity. The toothbrush head includes: a bristle combination body. A shape of the bristle combination body corresponds to a shape of the toothbrush head. The bristle combination body includes: a first lug boss and a pin, the first lug boss defines a pin installation hole, and the pin is in an interference fit with the pin installation hole. A top edge of the first lug boss is provided with a bristle limiting bone, and a bottom of the first lug boss is provided with a driven gear. The rotating shaft is provided with a driving gear meshed with the driven gear.